https://git.ruby-lang.org/ruby.git/commit/?id=4af2e4111b

From 4af2e4111b0e351464a62c73e4ea0ef8b27c43f5 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Wed, 14 Oct 2020 23:29:17 +0900
Subject: [ruby/reline] Deduplicate completed items

https://github.com/ruby/reline/commit/2dabf0c786

diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index 9bdccae..e5ecc8b 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -565,7 +565,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L565
       else
         i&.start_with?(target)
       end
-    }
+    }.uniq
     if is_menu
       menu(target, list)
       return nil
diff --git a/test/reline/test_key_actor_emacs.rb b/test/reline/test_key_actor_emacs.rb
index a1e4015..7bb5ac3 100644
--- a/test/reline/test_key_actor_emacs.rb
+++ b/test/reline/test_key_actor_emacs.rb
@@ -1281,6 +1281,36 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase https://github.com/ruby/ruby/blob/trunk/test/reline/test_key_actor_emacs.rb#L1281
     assert_equal(%w{foo_foo foo_bar foo_baz}, @line_editor.instance_variable_get(:@menu_info).list)
   end
 
+  def test_completion_duplicated_list
+    @line_editor.completion_proc = proc { |word|
+      %w{
+        foo_foo
+        foo_foo
+        foo_bar
+      }.map { |i|
+        i.encode(@encoding)
+      }
+    }
+    input_keys('foo_')
+    assert_byte_pointer_size('foo_')
+    assert_cursor(4)
+    assert_cursor_max(4)
+    assert_line('foo_')
+    assert_equal(nil, @line_editor.instance_variable_get(:@menu_info))
+    input_keys("\C-i", false)
+    assert_byte_pointer_size('foo_')
+    assert_cursor(4)
+    assert_cursor_max(4)
+    assert_line('foo_')
+    assert_equal(nil, @line_editor.instance_variable_get(:@menu_info))
+    input_keys("\C-i", false)
+    assert_byte_pointer_size('foo_')
+    assert_cursor(4)
+    assert_cursor_max(4)
+    assert_line('foo_')
+    assert_equal(%w{foo_foo foo_bar}, @line_editor.instance_variable_get(:@menu_info).list)
+  end
+
   def test_completion
     @line_editor.completion_proc = proc { |word|
       %w{
-- 
cgit v0.10.2


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